1 - As the cooking time varies depending on the quality and age of the beans, it is good to cook them in advance and to reheat them when you are ready to serve.

2 - Cook the drained beans in a fresh portion of unsalted water in a large saucepan with the lid on until tender, adding water to keep them covered, and salt when the beans have softened.

3 - They take 2–2 1/2 hours of gentle simmering.

4 - When the beans are soft, let the liquid reduce.

5 - It is usual to take out a ladle or two of the beans and to mash them with some of the cooking liquid, then stir this back into the beans.